Filter and communication equipment

Abstract

The invention provides a filter and communication equipment, the filter comprises a shell, the shell is internally provided with a plurality of resonance columns arranged at intervals, the head resonance column and / or the tail resonance column are / is internally provided with a central through hole and a low-pass assembly arranged in the central through hole, the low-pass assembly comprises a low-pass conductor piece, and the low-pass conductor piece is arranged in the central through hole. And one end of the low-pass conductor piece is used as a signal input / output port of the filter. The low-pass assembly of the filter is arranged in the resonant column, and the signal input port or the signal output port of the filter is formed on the low-pass conductor piece of the low-pass assembly, so that the low-pass assembly does not occupy the effective space in the filter, the optimal index of the filter is realized, and the filter has better far-end suppression performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to a filter and a communication device equipped with the filter. Background Art

[0002] As a key component in modern communication systems, filters are of self-evident importance. Their basic function is to allow useful signals to be transmitted efficiently on the signal link while maximally suppressing the interference of useless signals, thereby ensuring the quality of communication. With the rapid development and iterative updates of communication technology, the market's performance requirements for filters are increasing, especially in terms of size and weight. Users often expect to achieve high-performance filter design in extremely limited physical space. These high-performance requirements are specifically reflected in low insertion loss, high out-of-band suppression, high power carrying capacity, and low intermodulation.

[0003] In conventional coaxial cavity filters, there is a direct correlation between the structural size of the filter and its performance indicators. Generally speaking, the larger the size of the filter, the better its performance indicators (such as insertion loss, out-of-band suppression, and power capacity) tend to be; conversely, when the size is limited, the performance indicators of the filter will also decrease accordingly. Therefore, under the premise of a given structural size, the performance indicators of the filter have been basically determined, and it is difficult to significantly improve them through conventional means.

[0004] In practical applications, multiple strategies are usually adopted to optimize the performance of the filter. For example, by optimizing the single cavity structure, the Q value can be maximized, thereby reducing the insertion loss; by optimizing the topology and increasing the cross-coupling (zero point), the near-end out-of-band suppression index can be improved.

[0005] However, when users have higher requirements for far-end out-of-band suppression, it is generally necessary to introduce a low-pass filter to meet this demand. However, as an independent device, the introduction of the low-pass filter will inevitably occupy a certain size of space. When the overall size of the filter is limited, the introduction of the low-pass filter will inevitably squeeze the effective cavity space, thereby adversely affecting the overall performance of the filter. Specifically, it is manifested in increased insertion loss and decreased power handling capacity. Summary of the invention

[0006] The primary objective of the present invention is to solve at least one of the above problems and provide a filter and a communication device.

[0007] In order to meet one of the purposes of the present invention, a filter is provided, including a shell, in which a plurality of resonant columns arranged at intervals are arranged, wherein a first resonant column and / or a tail resonant column is provided with a central through hole and a low-pass component arranged in the central through hole, wherein the low-pass component includes a low-pass conductor, and one end of the low-pass conductor is used as a signal input / output port of the filter.

[0008] In one embodiment, the other end of the low-throughput conductor is connected to the housing.

[0009] In one embodiment, a coupling sheet is provided in the housing, and the low-throughput conductor is connected to the housing via the coupling sheet.

[0010] In one embodiment, a boss is provided on the inner side wall of the housing, one end of the coupling piece is connected to the boss, and the other end of the coupling piece is connected to the low-throughput conductor.

[0011] In one embodiment, a notch is formed on one end of the low-pass resonance column away from the bottom plate, and the coupling plate spans the notch.

[0012] In one embodiment, the low-pass component further includes a dielectric isolation sleeve, the dielectric isolation sleeve is arranged in the central through hole, and the low-pass conductor is inserted in the dielectric isolation sleeve.

[0013] In one embodiment, the low-pass component further includes a dielectric stopper, which is connected to the bottom end of the low-pass conductor and is also snap-fitted to an end of the central through hole close to the bottom opening.

[0014] In one embodiment, the central through hole includes a sleeve hole and a limiting hole arranged in sequence along the vertical direction of the low-pass resonant column, the aperture of the limiting hole is larger than the aperture of the sleeve hole, the bottom opening is arranged on the limiting hole, the dielectric isolation sleeve is arranged in the sleeve hole, the dielectric limiting member is arranged in the limiting hole, and the cross-sectional area of ​​the dielectric limiting member is larger than the cross-sectional area of ​​the sleeve hole.

[0015] In one embodiment, the multiple resonant cavities also include a first resonant cavity and a second resonant cavity that are adjacent to each other, a first coupling portion is provided on the resonant column in the first resonant cavity, and a second coupling portion is provided on the resonant column in the second resonant cavity, and the first coupling portion is adjacent to and relatively arranged to achieve capacitive coupling.

[0016] In order to meet one of the objectives of the present invention, a communication device is provided, comprising the filter as described in any one of the preceding objectives.

[0017] Compared with the prior art, the present invention has many advantages, including but not limited to:

[0018] (1) The filter of the present invention integrates the low-pass component directly on the resonant column and uses it as a signal port, which significantly reduces the effective space occupied by the filter, allowing the filter to achieve more complex filtering functions while maintaining a compact size, which is particularly important for the demand for miniaturized, high-performance filters in modern communication systems. By setting the low-pass component in the resonant column, the transmission path and filtering characteristics of the signal can be effectively controlled, thereby enhancing the far-end suppression capability of the filter. This means that the filter is more efficient in filtering out unwanted frequency components, can reduce signal interference, and improve signal quality.

[0019] (2) The filter of the present invention realizes signal input or output by embedding low-pass components into the resonant column respectively and utilizing the low-pass conductor inserted in the central through hole as the signal port, thereby greatly saving the internal space of the filter. This enables the filter to have a more compact structure while maintaining high performance, which is beneficial to the miniaturization of the filter and improves space utilization.

[0020] (3) As an important component of the filter, the low-pass component directly affects the frequency response characteristics of the filter, especially the far-end suppression performance. By building the low-pass component into the resonant column, the frequency response of the filter can be more effectively adjusted, especially the suppression effect at the far-end frequency, which helps to achieve a wider stopband and deeper attenuation, thereby improving the selectivity and anti-interference ability of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 FIG. 4 is a three-dimensional schematic diagram of a filter according to a typical embodiment of the present invention.

[0023] Figure 2 FIG. 4 is an exploded schematic diagram of a filter according to a typical embodiment of the present invention.

[0024] Figure 3 FIG. 1 is a schematic top view of a filter (top cover not shown) according to a typical embodiment of the present invention.

[0025] Figure 4 FIG. 4 is a partial cross-sectional schematic diagram of a filter according to a typical embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the structure of a filter (top cover not shown) according to a typical embodiment of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be interpreted as limiting the present invention.

[0028] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0030] The present invention provides a filter, wherein two low-pass components of the filter are separately arranged in two resonant columns, and a signal input port and a signal output port of the filter are respectively formed on the two low-pass components, so that the low-pass components do not occupy the internal effective space of the filter, so as to achieve the best filter index and better far-end suppression performance.

[0031] In an exemplary embodiment of the present invention, Figures 1 to 3 The filter 100 includes a housing 110 and a low-pass component. A plurality of resonant cavities 111 are disposed in the housing 110. A resonant column 112 is disposed in each resonant cavity 111. The plurality of resonant columns 112 are inductively coupled and / or capacitively coupled to enable the filter 100 to achieve filtering.

[0032] The housing 110 includes a bottom plate 113 and a plurality of side plates 114, wherein the plurality of side plates 114 are sequentially connected and arranged along the outer circumference of the bottom plate 113, and the plurality of side plates 114 and the bottom plate 113 are arranged to surround the housing 110, and the housing 110 has a top opening, and the plurality of resonant cavities 111 are arranged in the housing 110. The housing 110 is made of a metal material, and the housing 110 is integrally formed to facilitate production.

[0033] Two of the multiple resonant cavities 111 are low-pass resonant cavities 121, and the resonant columns in the low-pass resonant cavities 121 are called low-pass resonant columns 130. The low-pass component is disposed on the low-pass resonant column 130, and a low-pass component is disposed on each of the two low-pass resonant columns 130. The two low-pass resonant columns 130 are respectively the first and last resonant columns 112 of the multiple resonant columns 112 of the filter 100.

[0034] Specifically, combined Figure 2 and Figure 5 The low-pass resonance column 130 is vertically arranged in the low-pass resonance cavity 121. A central through hole 131 is provided in the low-pass resonance column 130. The central through hole 131 passes through from the top of the low-pass resonance column 130 to the bottom of the low-pass resonance column 130 along the vertical direction of the low-pass resonance column 130, and the central through hole 131 further extends through the bottom plate 113 of the shell 110 to form a bottom opening (not shown) on the bottom plate 113.

[0035] Combination Figures 2 to 4The low-pass component includes a low-pass conductor 141. In this embodiment, the low-pass conductor 141 is in a strip shape as an example to describe the present invention, but it should not be understood as limiting the present invention. The low-pass conductor 141 is inserted into the central through hole 131, and one end of the low-pass conductor 141 extends to the bottom opening of the central through hole 131 to form a signal port 1411, which is used to receive external signals or output the signal after the filter 100 completes filtering to the outside. The present invention arranges the low-pass conductor 141 in the central through hole 131 of the low-pass resonance column 130, so that the filter 100 has the best index and good far-end suppression performance, and does not occupy the effective space in the housing 110, so that other resonance columns 112 can be well arranged in the housing 110. The two low-pass resonance cavities 121 are respectively the first low-pass resonance cavity 151 and the second low-pass resonance cavity 161. The low-pass resonance column in the first low-pass resonance cavity 151 is called the first resonance column 152, and the low-pass conductor arranged in the first resonance column 152 is called the first low-pass resonance cavity 151. The first low-pass conductor 153, the signal port 1411 of the first low-pass conductor 153 constitutes the signal input port 154 of the filter 100; the low-pass resonant column in the second low-pass resonant cavity 161 is called the tail resonant column 162, the low-pass conductor disposed in the tail resonant column 162 is called the second low-pass conductor 163, and the signal port of the second low-pass conductor 163 constitutes the signal output port 164 of the filter 100; thus, the filter 100 is formed with a signal input port 154 and a signal output port 164 to realize signal input and output. In this embodiment, the first resonant column 152 and the tail resonant column 162 are respectively the first and last resonant columns 112 of the multiple resonant columns 112 of the filter 100.

[0036] In one embodiment, the first low-pass resonant cavity 151 and the second low-pass resonant cavity 161 are disposed adjacent to each other, which facilitates the arrangement of the other multiple resonant cavities 111 in the housing 110 , improves the space utilization of the housing 110 , and thus optimizes the communication performance of the filter 100 .

[0037] In an exemplary embodiment of the present invention, Figure 2 and Figure 4The low-pass component further includes a dielectric isolation sleeve 142, which is made of an insulating material, such as a dielectric material. The dielectric isolation sleeve 142 is inserted into the central through hole 131, and the low-pass conductor 141 is inserted into the dielectric isolation sleeve 142. It can be understood that the dielectric isolation sleeve 142 separates the central through hole 131 and the low-pass conductor 141 to avoid the low-pass conductor 141 from being directly physically connected to the corresponding low-pass resonant column 130 through the hole wall of the central through hole 131, that is, to avoid direct electrical connection between the low-pass conductor 141 and the low-pass resonant column 130, thereby improving the electrical performance of the filter 100 and optimizing the communication performance of the filter 100.

[0038] The low-pass component further includes a dielectric stopper 143, which is made of an insulating material, such as a dielectric material. The dielectric stopper 143 is disposed at the bottom of the central through hole 131, that is, the dielectric stopper 143 is disposed close to the bottom opening of the central through hole 131.

[0039] The dielectric stopper 143 is fixedly engaged with the central through hole 131, and the bottom end of the low-pass conductor 141 is also inserted into the dielectric stopper 143, and the low-pass conductor 141 is fixed to the dielectric stopper 143. Since the dielectric stopper 143 is also fixed to the central through hole 131, the low-pass conductor 141 cannot move in the direction of the top opening of the housing 110, thereby maintaining the structural stability of the filter 100, and further improving the stability of the communication performance of the filter 100. In addition, the dielectric stopper 143 also separates the low-pass conductor 141 from the central through hole 131 to avoid the physical connection between the low-pass conductor 141 and the low-pass resonant column 130 through the central through hole 131, that is, to avoid the direct electrical connection between the low-pass conductor 141 and the low-pass resonant column 130, thereby improving the electrical performance of the filter 100 and optimizing the communication performance of the filter 100.

[0040] The bottom end of the low-conductivity conductor 141 protrudes relative to the dielectric stopper 143 to be flush with the bottom opening, or the bottom end of the low-conductivity conductor 141 is disposed in the central through hole 131, or the bottom end of the low-conductivity conductor 141 protrudes outside the housing 110 relative to the bottom opening. The bottom end of the low-conductivity conductor 141 constitutes the signal port 1411, so that the filter 100 can receive or output signals.

[0041] In one embodiment, in combination Figure 4, the central through hole 131 is divided into a sleeve hole 1312 and a limiting hole 1313 in the vertical direction of the low-pass resonant column 130, that is, the sleeve hole 1312 and the limiting hole 1313 are connected to form the central through hole 131. Among them, the limiting hole 1313 is closer to the bottom plate 113 than the sleeve hole 1312, and the bottom opening is set in the limiting hole 1313. The aperture of the limiting hole 1313 is larger than the aperture of the sleeve hole 1312, so that the central through hole 131 forms a stepped hole structure.

[0042] The dielectric isolation sleeve 142 is installed in the sleeve hole 1312, and the dielectric limiting member 143 is installed in the limiting hole 1313. The cross-sectional area of ​​the dielectric limiting member 143 is larger than the cross-sectional area of ​​the sleeve hole 1312, so that the dielectric limiting member 143 cannot enter the sleeve hole 1312, and the low-conductivity conductor 141 inserted on the dielectric limiting member 143 will not move toward the direction of the top opening of the shell 110 under the action of the dielectric limiting member 143.

[0043] In an exemplary embodiment of the present invention, Figure 2 and Figure 3 The housing is further provided with a coupling piece 145, one end of which is connected to the low-conducting conductor 141, and the other end of which is connected to one of the side plates 114 of the housing 110, so that the low-conducting conductor 141 is electrically connected to the housing 110 via the coupling piece 145. In this embodiment, the coupling piece 145 is connected to the top of the low-conducting conductor 141.

[0044] Combination Figure 2 and Figure 5 A notch 132 is also formed on the top of the low-pass resonant column 130, and the notch 132 extends from the top of the low-pass resonant column 130 toward the bottom plate 113 along the vertical direction. The coupling plate 145 spans the notch 132, so that the coupling plate 145 is not connected to the corresponding low-pass resonant column 130, so as to prevent the low-pass conductor 141 from being electrically connected to the low-pass resonant column 130 through the coupling plate 145.

[0045] In one embodiment, in combination Figure 3, a boss 115 is also provided on the side plate 114, and the boss 115 is arranged in the housing 110, and the boss 115 is arranged to protrude relative to the side plate 114, so that the boss 115 is close to the corresponding low-pass resonant column 130. One end of the coupling piece 145 is connected to the boss 115, so that the coupling piece 145 is electrically connected to the housing 110 through the boss 115. By being arranged on the boss 115, the length of the coupling piece 145 can be shortened to prevent the excessively long coupling piece 145 from affecting the communication performance of the filter 100.

[0046] In a typical embodiment of the present invention, except for the two low-pass resonant cavities 121, the other multiple resonant cavities 111 of the shell 110 are each provided with a resonant column 112, and the multiple resonant columns 112 are inductively coupled and / or capacitively coupled to enable the filter 100 to achieve filtering.

[0047] Among them, combined Figure 3 and Figure 5 The multiple resonant cavities 111 of the shell 110 also include a first resonant cavity 171 and a second resonant cavity 181. The first resonant cavity 171 and the second resonant cavity 181 are arranged adjacent to each other. The resonant column in the first resonant cavity 171 is called a first resonant column 172, and the resonant column in the second resonant cavity 181 is called a second resonant column 182.

[0048] The first resonant column 172 is provided with a coupling portion (the coupling portion is referred to as a first coupling portion 173), the first coupling portion 173 is arranged near the top of the first resonant column 172, and the first coupling portion 173 is arranged to protrude toward the side wall of the housing 110 relative to the first resonant column 172. The second resonant column 182 is provided with a coupling portion (the coupling portion is referred to as a second coupling portion 183), the second coupling portion 183 is arranged near the top of the second resonant column 182, and the second coupling portion 183 is arranged to protrude toward the side wall of the housing 110 relative to the second resonant column 182.

[0049] The first coupling portion 173 and the second coupling portion 183 are adjacent to, opposite to, and spaced apart from each other. The first coupling portion 173 and the second coupling portion 183 are compatibly coupled, that is, the first resonant column 172 and the second resonant column 182 are capacitively coupled via the first coupling portion 173 and the second coupling portion 183, thereby facilitating filtering by the filter 100 and optimizing the communication performance of the filter 100.

[0050] In an exemplary embodiment of the present invention, Figure 1 and Figure 2The filter 100 also includes a top cover 191 and a plurality of tuning screws 192. The top cover 191 covers the top opening of the housing 110. The plurality of tuning screws 192 are arranged corresponding to the plurality of resonant columns 112 in the housing 110. The adjusting screws pass through the top cover 191 and are inserted into the corresponding resonant columns 112 so as to tune the operating frequency of the resonant columns 112 through the tuning screws 192.

[0051] In one embodiment, the top cover 191 is threadedly connected to the housing 110 by screws or bolts, so that the top cover 191 can be stably disposed on the housing 110 , thereby improving the structural stability of the filter 100 .

[0052] The present invention further provides a communication device, wherein the communication device comprises the filter 100 described above.

[0053] In one embodiment, the communication device is a duplexer, and the filter 100 described above is built in the duplexer.

[0054] In one embodiment, the communication device is a combiner, and the filter 100 described above is built in the combiner.

[0055] In one embodiment, the communication device is an antenna, and the filter 100 described above is disposed in the antenna.

[0056] In summary, the filter of the present invention arranges the low-pass component in the central through hole of the low-pass resonant column, and the low-pass component forms the signal port of the filter. The low-pass component does not occupy the effective space in the shell. While achieving the optimal filter index, it also has better far-end suppression to optimize the communication performance of the filter.

[0057] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

[0058] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A filter, characterized in that: It comprises a shell, in which a plurality of resonant columns arranged at intervals are arranged, wherein a central through hole and a low-pass component arranged in the central through hole are provided in the first resonant column and / or the tail resonant column, and the low-pass component comprises a low-pass conductor, and one end of the low-pass conductor is used as a signal input / output port of the filter.

2. The filter according to claim 1, characterized in that The other end of the low-throughput conductor is connected to the housing.

3. The filter according to claim 1, characterized in that A coupling sheet is arranged in the shell, and the low-throughput conductor is connected to the shell through the coupling sheet.

4. The filter according to claim 3, characterized in that A boss is provided on the inner side wall of the shell, one end of the coupling piece is connected to the boss, and the other end of the coupling piece is connected to the low-throughput conductor.

5. The filter according to claim 3 or 4, characterized in that A notch is formed on one end of the low-pass resonance column away from the bottom plate, and the coupling plate spans the notch.

6. The filter according to claim 1, characterized in that The low-pass component further comprises a dielectric isolation sleeve, the dielectric isolation sleeve is arranged in the central through hole, and the low-pass conductor is inserted in the dielectric isolation sleeve.

7. The filter according to claim 1, characterized in that The low-pass component further includes a dielectric stopper, which is connected to the bottom end of the low-pass conductor and is also clamped with an end of the central through hole close to the bottom opening.

8. The filter according to claim 7, characterized in that The central through hole includes a sleeve hole and a limiting hole arranged in sequence along the vertical direction of the low-pass resonant column, the aperture of the limiting hole is larger than the aperture of the sleeve hole, the bottom opening is arranged on the limiting hole, the dielectric isolation sleeve is arranged in the sleeve hole, the dielectric limiting member is arranged in the limiting hole, and the cross-sectional area of ​​the dielectric limiting member is larger than the cross-sectional area of ​​the sleeve hole.

9. The filter according to claim 1, characterized in that The multiple resonant cavities also include a first resonant cavity and a second resonant cavity that are adjacently arranged. A first coupling portion is provided on the resonant column in the first resonant cavity, and a second coupling portion is provided on the resonant column in the second resonant cavity. The first coupling portion and the second coupling portion are adjacent to and relatively arranged to achieve capacitive coupling.

10. A communication device, characterized in that: Comprising the filter according to any one of claims 1 to 9.

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